Disazo orange dye and process of making same.



UNITED STATES PAT NT OFFICEa HEINRICH AUGUST BERNTI-ISEN, OF MANNHEIM, AND PAUL JULIUS, OF

LUDWIGSHAFEN, GERMANY, ASSIGNORS vTO THE BADISOHE ANILIN AND SODA FABRIK, OF LUDWIGSHAFEN, GERMANY.

DISAZO ORANGE DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming art Of Letters Patent N0. 631,611, dated August 22, 1899 Application filed May 16, 1899. Serial No. 717,051. (No specimens.)

To aZZ whom it may concern:

Be it known that we, HEINRICH AUGUST BERNTHSEN, a subject of the King of Prussia, German Emperor, residing at Mannheim, in the Grand Duchy of Baden, and PAUL JULIUS,

' a subject of the Emperor of Austria-Hungary,

residing at Ludwigshafen-on-the-Rhine, in the Kingdom of Bavaria, Empire of Germany, doctors of philosophy,'have invented new and useful Improvements in the Manufacture of New Substantive Coloring-Matters for Cotton, (for which application for Letters Patent has been made in Germany, No. 1324,348, February 28, 1899; in England, No. 6,827, March 29, 1899; in France, No. 275,575, April 8, 1899, certificated Addition du Brevet No. 280,914,) of which the following is a specification.

Our invention consists in the production of substantive azo coloring-matters, which are mixed disazo dyes obtained by the combination of a tetrazo compound such as that derived from benzidin, first, with amido -R acidthat is,beta-naphthylamin-3. 3-disulfoacid-or with amido-F acidthat is, betanaphthylamin-3.2-disulfoacid, (see Tauber and Norman, Dert'oate des Naphtalins, pp. 26 and 27,) and as second component a nitrodiamin-namely, nitro meta phenylene diamin or nitro-meta-toluylene-diamin.

Our new coloring-matter,however prepared, has a brilliant and beautiful orange shade, good coloring power, and great fastness against the action of light, acids, and chlorin. It is also more readily soluble in water than are some of the similar orange dyes hitherto known and used, and in spite of this greater solubility the affinity for the fiber is unimpaired. Its aqueous solution is orange-red in color. Hydrochloric acid added to the aqueous solution produces a brown precipitate. It dissolves in sulfuric acid, giving a deep-blue solution. On addition of sodium nitrite and hydrochloric acid to the aqueous solution a practically black mixture is obtained which turns dull red to brown on boiling.

The following example will serve to illustrate the manner in which the invention can best be carried into practical effect. are by weight.

Example: Prepare in the well-known way an intermediate product from ninety two Parts little water and introduce it into a solution of about eighty parts of nitro-meta-phenylene-diamin in about thirty thousand parts of water at a temperature of about 45 to centigrade. Stir the mixture for about four hours, while maintaining the temperature at about 50 centigrade. Then gradually raise the temperature to 90 centigrade. When the color of the mixture is becoming light brownish red, add sufiicient carbonate of soda to make the solution alkaline and precipitate the coloring matter by means of common salt. Filter, press, and dry. The coloringmatter so obtained dyes cotton a brilliant redorange without the aid of a mordant.

In the above exampleinstead of the sodium salt of amido-R acid the corresponding salt of amido-F acid can be used to prepare the intermediate product, and instead of nitrometa-phenylene-diamin nitro-m eta-toluylenediamin can be used.

Now what we claim is- 1. The new mixed disazo coloring-matter which can be obtained from benzidin, the herein-described beta-naphthylamin-disulfoacids and nitro-diamins, and which yields an orange-red solution in water, a deep-blue solution in sulfuric acid and on the addition of sodium nitrite and hydrochloric acid to the aqueous solution a dark practically black color which turns dull red to brownish on boiling.

2. The herein-described process for the manufacture of a new orange coloring-matter by combining the tetrazo compound of benzidin first with the herein-described betanaphthylamin-disulfoacids and then combin- I Witnesses:

GUsTAv L. LICHTENBERGER, ADOLPH REUTLINGER. 

